[英]Convert .txt to .csv in shell
I have a text file:我有一个文本文件:
ifile.txt
1 4 22.0 3.3 2.3
2 2 34.1 5.4 2.3
3 2 33.0 34.0 2.3
4 12 3.0 43.0 4.4
I would like to convert it to a csv file:我想将其转换为 csv 文件:
ofile.txt
ID,No,A,B,C
1,4,22.0,3.3,2.3
2,2,34.1,5.4,2.3
3,2,33.0,34.0,2.3
4,12,3.0,43.0,4.4
I was trying with this, but not getting the result.我正在尝试这个,但没有得到结果。
(echo "ID,No,A,B,C" ; cat ifile.txt) | sed 's/<space>/<comma>/g' > ofile.csv
Only sed and nothing else只有 sed 而没有别的
sed 's/ \+/,/g' ifile.txt > ofile.csv
cat ofile.csv猫文件.csv
1,4,22.0,3.3,2.3
2,2,34.1,5.4,2.3
3,2,33.0,34.0,2.3
4,12,3.0,43.0,4.4
awk
may be a bit of an overkill here. awk
在这里可能有点矫枉过正。 IMHO, using tr
for straight-forward substitutions like this is much simpler:恕我直言,使用tr
进行这样的直接替换要简单得多:
$ cat ifile.txt | tr -s '[:blank:]' ',' > ofile.txt
here is the awk version这是 awk 版本awk 'BEGIN{print "ID,No,A,B,C"}{print $1","$2","$3","$4","$5}' ifile.txt
output:输出:
ID,No,A,B,C
1,4,22.0,3.3,2.3
2,2,34.1,5.4,2.3
3,2,33.0,34.0,2.3
4,12,3.0,43.0,4.4
Try this ..试试这个..
tr -s " " < ifile.txt | sed 's/ /,/g' > ofile.txt
OUTPUT输出
1,4,22.0,3.3,2.3
2,2,34.1,5.4,2.3
3,2,33.0,34.0,2.3
4,12,3.0,43.0,4.4
One possibility, not necessarily the best, is:一种可能性,不一定是最好的,是:
sed -e '1i\
ID,No,A,B,C' -e 's/[[:space:]]\{1,\}/,/g' ifile.txt
Insert the heading before line 1;在第 1 行之前插入标题; change each sequence of one or more space-like characters to a comma.将一个或多个类似空格的字符的每个序列更改为逗号。 The line break is necessary in traditional (POSIX standard — in this case, BSD or Mac OS X) sed
;换行符在传统(POSIX 标准——在这种情况下,BSD 或 Mac OS X) sed
是必要的; GNU sed
allows you to use: GNU sed
允许您使用:
/opt/gnu/bin/sed -e '1i\' -e 'ID,No,A,B,C' -e 's/[[:space:]]\{1,\}/,/g'
Output:输出:
ID,No,A,B,C
1,4,22.0,3.3,2.3
2,2,34.1,5.4,2.3
3,2,33.0,34.0,2.3
4,12,3.0,43.0,4.4
Alternatively, and more simply, have sed
deal with the file and use echo
to add the header, as you did in outline:或者,更简单的是,使用sed
处理文件并使用echo
添加标题,就像您在大纲中所做的那样:
{
echo "ID,No,A,B,C"
sed -e 's/[[:space:]]\{1,\}/,/g' ifile.txt
} > ofile.txt
On review, this is probably what I'd use.经过审查,这可能是我会使用的。
Simply do it using awk command .只需使用awk命令即可。
awk '{
printf("%d, %d, %.1lf, %.1lf,%.1lf\n", $1,$2,$3,$4,$5);
}' input.txt > output.csv
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